Here in Canada, most newer cars seem to all have front fog lights, but I've honestly never seen a car with rear fog lights. I'll hook them up since they are a simple 12V connection and some provinces here require any fitted lights to be functional during inspections.

Yes high intensity fog warning light, some cars have them on both sides and some just on the drivers side of vehicle depending on which side of road you drive on, Here in uk they have to be working on the right side to pass the yearly road inspection (MOT) , Diablo not needing fog lamps usually have 2 reverse ights in there place.

Thanks Casper. I Googled "Aventador fog lights" and this image of a Pocher kit came up. That person calls them rear fog lights too (unfortunately it was the only picture of them)...but I think that's good enough to confirm that's what they are. I guess I'll hook them up and use them as fog lights....not that I plan on driving my Aventador in the fog...

Ok...this is really bugging me. Can someone tell me what this innermost red light is used for on the OEM Aventador tail light? (As per the picture below, the light in question is the one next to the reverse light...). I've searched the internet and can't find any pics or videos of this light being used.